Sometimes Id run out of bombs near the entrance to IC and I didnt want to risk running too far in only to have bombs pop on my kiting path
if you spend a little time in ifrits learning the way around then repops are pretty much never a problem and the increased number of mobs can lead to faster exp.
if my targets were the volcanic gas type bombs, then i would enter ifrits using the eastern entrance and take the first right turning and my first target is the volcanic gas that roams near the flame spout. Then head south again past the entrance and is usually a second bomb roaming this path somewhere which i'd kill and then head north again to the point on the map where the ??? is for one of the bastok missions. Sometimes theres a bomb close to the edge that makes a good 3rd target. id kill that if possible or carry on south and west coming into the open area with another bomb and the tunnel accross from you has another bomb in there.
after killing all these and exiting the tunnel (point B on map1) you find yourself in the centre of the volcano where theres yet another bomb and the alter of ashes close to you, taking one of the two tunnels near the alter will take you toward the western zone entrance map i would proceed through here killing the bombs on the way and then take the path (pointK on map3) towards the bomb queen spawn point. at this point sneak becomes very important all the time not just at night, you can proceed west (point L on map 7, along this route somewhere youll start to encounter volcaninc bombs, a tougher version of the volcanic gas mobs but your route should be heading towards point E and then on to A on the respective maps and you'll find your self coming out back near the first flame spout and the position of the first bomb that you killed repopped and ready for you to start the circle again.
i got chain 6-7 several times following this route and on occasion i've even made it round the full loop back to the first flame spout before the first bomb has repopped, then when your levels get higher at the point where you come back into the centre of the volcano at point E you can start to venture down path H and proceed to kill the Volcanic Bombs (tougher mobs than volcanic gas) and take a slightly different loop around the zone.
a big plus point to taking these routes is that you pass virtually all the coffer pop points so any keys you pick up along the way can net you some gils quite easily and then theres also the pop items for the bomb queen, I'd made about 6 full pop sets plus a few spare ashes in the course of my soloing adventures, by the time id bazaared those plus opened all the coffers id found on my treks i must've made about 600k gils :D